Add jf-assembler executable

This service reconstructs the various modules and sends out a
image metadata stream for further consumers.

jf-assembler/include/assembler_config.hpp

@@ -0,0 +1,14 @@
+namespace assembler_config
+{
+    // N of IO threads to send image metadata.
+    const int ASSEMBLER_ZMQ_IO_THREADS = 1;
+
+    // If the modules are offset more than 1000 pulses, crush.
+    const uint64_t PULSE_OFFSET_LIMIT = 100;
+
+    // Number of times we try to re-sync in case of failure.
+    const int SYNC_RETRY_LIMIT = 3;
+
+    // Number of pulses between each statistics print out.
+    const size_t ASSEMBLER_STATS_MODULO = 1000;
+}